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A Roller for Preventing Pipe Body from Clamping after Cross-rolling and Piercing
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A cross-rolling piercing and rolling technology, which is applied in the direction of rolling, metal rolling, metal rolling, etc., can solve the problems of back jamming and gap increase, reduce plug wear, improve rolling rhythm, and have good wall thickness uniformity Effect
Active Publication Date: 2019-12-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology
[0004] Aiming at the defects and deficiencies of the existing preparation technology, the object of the present invention is to provide a roll that prevents thick-walled tubes from getting stuck after cross-rolling and piercing, so that the gap between the plug and the billet increases, ensuring that the tail of the billet is smoothly separated from the plug, and solves the problem of Post-stuck problem of thick-walled pipe during cross-rolling and piercing
Method used
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Embodiment 1
[0061] In this example, the diameter D of the blank before piercing p = 45mm, then the radius R of the required roll = 120mm, the roll feeding angle β = 15°, the rolling angle γ = 15°, Roll entrance section length L 1 =105mm, the length of roll exit section L 2 =137mm, roller distance D ck =41.4mm, combined with R in the present invention x1 , R y1 , R x2 , R y2 , R 1 , R 2 The calculation formula obtained: the center O of the first circular arc 1 The coordinates are (100.7, 274.7), radius = 407.3mm; the center O of the second arc 2 The coordinates of are (178.6, 658.7), radius=798.9mm; i=10mm, j=10mm.
[0062] The roll surface curve of the roll is determined according to the first arc, the intersection point of the first arc and the roll inlet end face, the second arc, and the intersection point of the second arc and the roll exit end face, and the obtained roll shape is as follows image 3 and Figure 4 shown.
Embodiment 2
[0064] In this embodiment, ordinary conical rollers are used to perforate the TC4 bar. First, a TC4 bar with a size of Φ45×200 mm is obtained as the original blank by machining. After heating to 960°C to remove the surface scale, the cross-rolling piercing test was carried out. The roll speed is 70r / min, the feeding angle and rolling angle are both 15°, the size of the plug during the piercing process is Φ20×40mm, the diameter reduction rate is 8%, and the front reduction rate is 6%. After the jam occurs during the piercing process, the blank cannot be completely separated from the plug, such as Figure 5 shown.
Embodiment 3
[0066] In this example, the roll obtained in Example 1 is used to perforate the TC4 bar, and a TC4 bar with a size of Φ45×200 mm is obtained as the original blank by machining. After heating to 960°C to remove the surface scale, the cross-rolling piercing test was carried out. The roll speed is 70r / min, the feeding angle and rolling angle are both 15°, the size of the plug during the piercing process is Φ20×40mm, the diameter reduction rate is 8%, and the front reduction rate is 6%. No post jamming occurred during the piercing process, and the pipe blank after piercing was air-cooled at room temperature to obtain a thick-walled pipe with a length of 223 mm, as shown in Figure 6 shown.
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Abstract
The invention discloses a roll for preventing jamming of a pipe body after cross-rolling and perforation. The roll is a tapered roll. The arc is determined, and the inner expansion of the roll of the present invention is significantly larger than that of the ordinary tapered roll, which is more conducive to the separation of the billet and the plug in the cross-rolling piercing, and is more conducive to the piercing and rolling of large-diameter tube blanks under the same process parameters. In the initial stage of piercing, the billet is bitten smoothly, and the steady-state rolling process is stable. At the end of piercing, there are no problems such as the plug not piercing out and the tail being stuck, which reduces the wear of the plug and improves the rolling rhythm. The obtained thick-walled tube The wall thickness uniformity of the tube blank is good.
Description
technical field [0001] The invention belongs to the technical field of pipe material processing, and in particular relates to a roll for preventing jamming of thick-walled pipes after cross-rolling and piercing. Background technique [0002] Back jamming refers to the jamming that occurs in the unstable stage when the metal at the tail of the tube blank gradually leaves the deformation zone. As the most common problem in the process of oblique rolling and piercing of thick-walled tubes, its main manifestations are: (1) The plug is not exposed, and the jamming The part is a round head and the end is concave; (2) The top part is exposed or completely exposed, but it cannot be separated from the blank. Cross rolling piercing process such as figure 1 shown. [0003] The main reasons for the back jam problem are: (1) The plug is severely worn during the piercing process, and even partially melts, causing the plug and the blank to stick together, causing the phenomenon of wrappi...
Claims
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Application Information
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Patent Type & Authority Patents(China)
IPC IPC(8): B21B19/04B21B27/02G06F17/50
CPCB21B19/04B21B27/025G06F30/17
Inventor 庞玉华王杨康荻娜罗远林鹏程何威威
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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